Back, now, at 7:41 with our colleague, christiane amanpour. In a special on abc, christiane goes inside to look at the history and the mysteries of the bible. You met with one scientist who says there's proof that the great flood that took noah's ark existed? As you can imagine, historians, archaeologists, discovers, are trying to figure out were these stories true? Nobody thinks they will find an ark. For obvious reasons, wood, decay. But robert ballard, who found the "titanic" ship wreck in 1985, believe there's evidence massive flood about 7,000 years ago, which is when the bible situates noah's story. And he thinks it's in the black sea region offer t er tturkey. Let's take a listen. Our journey to investigate noah and his ark, led us to the black sea in turkey, where we heard that tantalizing clues were being uncovered by dr. Robert ballard, one of the world's leading underwater archaeologists. We were astonished to learn that he believes the biblical flood could have actually happened. And he says he can find proof. If you were to discover definitively something that could pin science on the noah story, how fantastic would that be? It would be pretty cool. And I'm confident we can. We just have to look. Reporter: Now, using advanced robotic technology, he's traveling even further back in time. I'm putting a lot of money in the water. And obviously, can't wait to see what it's going to see. We're talking about the floods of our living history, they don't compare at all to the floods of ancient times. The question is, was there a mother of all floods? Reporter: Ballard thinks there was. And he's testing a controversial theory that the biblical flood happened here. Why the black well, because the black sea appears to have had a giant flood. Not just a slow-moving, advan advancing rise of sea level. But a really big flood. And people were living there. Reporter: The theory goes, this was once an isolated, fresh-water lake. But then, when the mediterranean swelled -- it broke through and flooded violently. Reporter: What did noah or people who were living during this flood, what did they see? It probably was a bad day. And a lot of real estate, 150,000 kilometers of land went ur7bd. And 400 feet below the surface, ballard believes he found proof of that catastrophic event. I love it. I love it. Reporter: They unearthed an ancient shoreline. We actually dated it, about 5,000 b.C. Reporter: That's about the time the bible says noah and the great flood happen. I mean, wow. Wow. So, it nailed it. What an adventure this must been. It really was an adventure. We trace moses' steps up mt. Sinai. We trace abraham's path. It's a healing message. This is the old testament. It shows how jews, christians, muslims, have the same patriarch, abraham. And a fantastic adventure we were on. And beautiful shooting over the middle east. It's fabulous. Cannot wait to see it. It begins tonight. "Back to the beginning." It's tonight on abc. And next friday. A two-part special. Looking forward to it. Thanks, george. Coming up, the stories

This transcript has been automatically generated and may not be 100% accurate.

{"id":18034944,"title":"Mysteries of the Bible: Proof of Noah's Ark?","duration":"3:41","description":"Christianne Amanpour talks to a scientist who says there is proof of the great flood.","url":"/GMA/video/mysteries-bible-proof-noahs-ark-christiane-amanpour-investigates-18034944","section":"GMA","mediaType":"Default"}